Preparation method of methyl tin mercaptide

Abstract

The invention belongs to the technical field of preparation of methyl tin mercaptide, and particularly relates to a preparation method of methyl tin mercaptide, which comprises the following steps: S1, planing tin bricks with better quality into tin sheets, and putting the tin sheets into a reactor; s2, metal tin and a first catalyst are put into a reaction kettle, then chloromethane is introduced for halogenation, then a redistribution agent is added for a tinning reaction, distillation is performed, fractions with the gas temperature ranging from 150 DEG C to 230 DEG C are received, and then pure water is used for absorption to obtain a methyl tin chloride aqueous solution; the methyl vinyl chloride comprises dimethyl tin dichloride and methyl tin trichloride; and S3, adding the obtained methyl tin chloride aqueous solution into isooctyl thioglycolate, adding a second catalyst, carrying out a stirring reaction at a temperature of 5-15 DEG C for 0.2-0.4 h, adding an alkali liquor, carrying out a continuous stirring reaction until the pH value of the reaction system reaches 7-9, heating to 60-70 DEG C, carrying out a reaction for 1-1.5 h, standing, cooling, and layering.

Description

technical field

[0001] The invention belongs to the technical field of tin methyl mercaptide preparation, and in particular relates to a preparation method of tin methyl mercaptide. Background technique

[0002] Methyl tin mercaptide is one of the three major organotin varieties. It is a transparent, clear and viscous liquid with good compatibility with PVC. Compatible with polar oils, non-flammable, low freezing point, viscous liquid even at -20°C;

[0003] The industrial product is mainly a mixture of dimethyl tin mercaptide and monomethyl tin mercaptide, the general product is the weight ratio of monomethyl tin mercaptide to dimethyl tin mercaptide is 20:80, and monomethyl tin mercaptide is Tin has excellent stability in the early stage, and dimethyl tin mercaptide shows better stability in the later stage. Methyltin mercaptide has been approved by the US FDA (21 CFR 178.2010) and certified by the German BGA (ⅡA, 4C). It can be used in food packaging materials and water...

Examples

Embodiment 1

[0022] A preparation method for tin methyl mercaptide, comprising the steps of:

[0023] S1. Plane tin bricks with better quality into tin sheets and place them in the reactor;

[0024] S2. Put metal tin and the first catalyst into the reaction kettle, then pass through methyl chloride for halogenation, then add redistribution agent for tinning reaction, distill and accept the fraction with gas temperature within 150-230°C, and then use pure Water absorption obtains methyl tin chloride aqueous solution; Described methyl olefin chloride comprises dimethyl tin dichloride and monomethyl tin trichloride;

[0025] S3. Add the obtained methyl tin chloride aqueous solution to isooctyl thioglycolate, add the second catalyst, stir and react at a temperature of 5-15°C for 0.2-0.4 hours, then add lye and continue to stir the reaction until the pH value of the reaction system reaches 7-9, then be warming up to 60-70 ℃, react 1-1.5 hours, static, cooling, layering; The mol ratio of descri...

technical field

[0001] The invention belongs to the technical field of tin methyl mercaptide preparation, and in particular relates to a preparation method of tin methyl mercaptide. Background technique

[0002] Methyl tin mercaptide is one of the three major organotin varieties. It is a transparent, clear and viscous liquid with good compatibility with PVC. Compatible with polar oils, non-flammable, low freezing point, viscous liquid even at -20°C;

[0003] The industrial product is mainly a mixture of dimethyl tin mercaptide and monomethyl tin mercaptide, the general product is the weight ratio of monomethyl tin mercaptide to dimethyl tin mercaptide is 20:80, and monomethyl tin mercaptide is Tin has excellent stability in the early stage, and dimethyl tin mercaptide shows better stability in the later stage. Methyltin mercaptide has been approved by the US FDA (21 CFR 178.2010) and certified by the German BGA (ⅡA, 4C). It can be used in food packaging materials and water...

Examples

Embodiment 1

[0022] A preparation method for tin methyl mercaptide, comprising the steps of:

[0023] S1. Plane tin bricks with better quality into tin sheets and place them in the reactor;

[0024] S2. Put metal tin and the first catalyst into the reaction kettle, then pass through methyl chloride for halogenation, then add redistribution agent for tinning reaction, distill and accept the fraction with gas temperature within 150-230°C, and then use pure Water absorption obtains methyl tin chloride aqueous solution; Described methyl olefin chloride comprises dimethyl tin dichloride and monomethyl tin trichloride;

[0025] S3. Add the obtained methyl tin chloride aqueous solution to isooctyl thioglycolate, add the second catalyst, stir and react at a temperature of 5-15°C for 0.2-0.4 hours, then add lye and continue to stir the reaction until the pH value of the reaction system reaches 7-9, then be warming up to 60-70 ℃, react 1-1.5 hours, static, cooling, layering; The mol ratio of descri...